\documentclass{standalone}
\usepackage{tikz}
\usepackage{ctex,siunitx,mhchem}
\setCJKmainfont{Noto Serif CJK SC}
\usepackage{tkz-euclide}
\usepackage{amsmath}
\usetikzlibrary{patterns, calc}
\usetikzlibrary {decorations.pathmorphing, decorations.pathreplacing, decorations.shapes,}
\begin{document}
\small
\begin{tikzpicture}[>=latex,scale=1.6]
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      \node[circle,draw,inner sep=3pt]at (\x,\y){\ce{Si}};
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      \draw (\x+0.05,\y-0.5)--++(0,0.2)arc(0:180:0.05)--++(0,-0.2);
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\end{tikzpicture}
\end{document}